This instrument is made and designed as per national standard of People’s Republic of China GB/T 8017 Petroleum Products- Determination of vapor pressure- Reid method. It can also be used to do determination according to ASTM D323 Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method). It is used to make determination for vapor pressure of gasoline, volatile crude oil and other volatile petroleum products. It cannot be used to determine the vapor pressure of LGP. It is fully-automatic vapor pressure tester by PC control and operation.